[ntp:questions] Need suggestion on compensating clock drift on Xen based VPS

Ryan Malayter malayter at gmail.com
Fri Nov 13 15:36:54 UTC 2009


On Thu, Nov 12, 2009 at 7:24 AM, Ulrich Windl
<Ulrich.Windl at rz.uni-regensburg.de> wrote:
> Maybe Dave could write an article about "Time in virtual machines" (if
> not done already) ;-)

I'm not too sure how much that would help anybody. It would probably
go something like this:

1) Timekeeping in VMs sucks, but out of necessity. The timing hardware
is virtualized inside each guest, and each VM only gets "slices" of
real CPU and wall-clock time, so timekeeping is difficult.
2) The process by which the timing hardware is virtualized is
implementation-specific. VMware Server, WMware ESX, Xen, Hyper-V, KVM,
etc. all do this a little differently. Consult your virtualization
software's documentation for best practices regarding timekeeping
inside virutalized guests. Some may have custom drivers or other tools
to help.

-- 
RPM



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